U.S. patent application number 11/692311 was filed with the patent office on 2007-07-26 for azeotrope-like solvent composition and mixed solvent composition.
This patent application is currently assigned to ASAHI GLASS CO., LTD.. Invention is credited to Michiomi NAGASE, Masaaki Tsuzaki.
Application Number | 20070173432 11/692311 |
Document ID | / |
Family ID | 36142727 |
Filed Date | 2007-07-26 |
United States Patent
Application |
20070173432 |
Kind Code |
A1 |
NAGASE; Michiomi ; et
al. |
July 26, 2007 |
AZEOTROPE-LIKE SOLVENT COMPOSITION AND MIXED SOLVENT
COMPOSITION
Abstract
To provide a solvent composition capable of removing soils such
as dusts and oils attached to the surface of an article made of an
acrylic resin or an article coated with an acrylic resin, without
damaging it. An azeotrope-like solvent composition comprising from
38 to 41 mass % of
(2,2,2-trifluoroethoxy)-1,1,2,2-tetrafluoroethane and from 59 to 62
mass % of perfluorohexane. A mixed solvent composition comprising
from 30 to 60 mass % of
(2,2,2-trifluoroethoxy)-1,1,2,2-tetrafluoroethane and from 40 to 70
mass % of perfluorohexane.
Inventors: |
NAGASE; Michiomi;
(Ichihara-shi, JP) ; Tsuzaki; Masaaki;
(Ichihara-shi, JP) |
Correspondence
Address: |
OBLON, SPIVAK, MCCLELLAND, MAIER & NEUSTADT, P.C.
1940 DUKE STREET
ALEXANDRIA
VA
22314
US
|
Assignee: |
ASAHI GLASS CO., LTD.
Tokyo
JP
|
Family ID: |
36142727 |
Appl. No.: |
11/692311 |
Filed: |
March 28, 2007 |
Related U.S. Patent Documents
|
|
|
|
|
|
Application
Number |
Filing Date |
Patent Number |
|
|
PCT/JP05/18450 |
Oct 5, 2005 |
|
|
|
11692311 |
Mar 28, 2007 |
|
|
|
Current U.S.
Class: |
510/408 ;
510/415 |
Current CPC
Class: |
C11D 7/5063 20130101;
C11D 7/28 20130101 |
Class at
Publication: |
510/408 ;
510/415 |
International
Class: |
C11D 17/00 20060101
C11D017/00 |
Foreign Application Data
Date |
Code |
Application Number |
Oct 5, 2004 |
JP |
2004-292618 |
Claims
1. An azeotrope-like solvent composition comprising from 38 to 41
mass % of (2,2,2-trifluoroethoxy)-1,1,2,2-tetrafluoroethane and
from 59 to 62 mass % of perfluorohexane.
2. A mixed solvent composition comprising from 30 to 60 mass % of
(2,2,2-trifluoroethoxy)-1,1,2,2-tetrafluoroethane and from 40 to 70
mass % of perfluorohexane.
3. A method of cleaning an article to be cleaned, which comprises
bringing the solvent composition as defined in claim 1 into contact
with the surface of the article to remove soils attached to the
article.
4. A method of dewatering an article to be cleaned, which comprises
bringing the solvent composition as defined in claim 1 into contact
with the surface of the article to remove water attached to the
article.
5. The method of cleaning an article to be cleaned according to
claim 3, wherein the soils are oils.
6. The method of cleaning an article to be cleaned according to
claim 3, wherein the article is made of an acrylic resin.
7. The method of dewatering an article to be cleaned according to
claim 4, wherein the article is made of an acrylic resin.
Description
TECHNICAL FIELD
[0001] The present invention relates to solvent compositions to be
used for removing soils such as oils and dusts attached to the
surface of articles, e.g., electronic components such as IC,
precision mechanical parts, glass substrates, molded-resin parts,
etc.
BACKGROUND ART
[0002] Heretofore, in the precision mechanical industry, the
optical instrument industry, the electrical and electronics
industry and plastics industry, halogenated hydrocarbons have been
known as solvents used for precision cleaning to remove soils such
as oils, dusts, etc. attached to the surface of articles during
manufacturing processes or the like.
[0003] However, since halogenated hydrocarbons such as
chlorofluorocarbons or hydrochlorofluorocarbons have ozone
depleting potential, researches to develop solvents that can
substitute such halogenated hydrocarbons have recently been
conducted, and hydrofluoroethers (hereinafter referred to as HFEs)
are known as the solvents. HFEs have advantages such that they are
inflammable, have excellent chemical and thermal stabilities, have
excellent properties in drying, and have zero ozone depleting
potential and low global warming potential. For example, HFE-7100
(C.sub.4F.sub.9OCH.sub.3, trade name of 3M) and HFE-7200
(C.sub.4F.sub.9OC.sub.2H.sub.5, trade name of 3M) are known as
HFEs.
[0004] Generally, since HFEs have low solvency to oils as compared
with the halogenated hydrocarbons, there has been a problem such
that HFEs are difficult to be used as cleaning agents in place of
the halogenated hydrocarbons.
[0005] However, the present inventors have found that
(2,2,2-trifluoroethoxy)-1,1,2,2-tetrafluoroethane which is one of
HFEs, can dissolve several oils, e.g. Panasate 810 (trade name of
NOF CORPORATION).
[0006] However, in a case where an article to which Panasate 810 is
attached is cleaned by using
(2,2,2-trifluoroethoxy)-1,1,2,2-tetrafluoroethane, if the article
is comprised of an acrylic resin or coated with an acrylic resin,
there have been problems such that haze or cracking occurs on the
surface of the article, and dissolution of the acrylic resin
occurs.
[0007] On the other hand, Patent Document 1 discloses that an
azeotrope-like composition comprising
(2,2,2-trifluoroethoxy)-1,1,2,2-tetrafluoroethane and an alcohol
such as methanol is useful as a removing agent for e.g. flux or
oil, a cleaning agent for electronic components, resin-processed
parts or optical lenses, or a dewatering/drying agent.
[0008] However, since the compositions disclosed in Patent Document
1 have significant effects on several resins such as an acrylic
resin, there has been a problem such that in a case where an
acrylic resin or an article coated with an acrylic resin is
contacted with the compositions, haze, cracking or dissolution of
the acrylic resin occurs.
[0009] Further, a perfluorocarbon such as perfluorohexane is also a
compound having zero ozone depleting potential, but if it is used
as a cleaning agent for e.g. oil, cleaning fails because its
cleaning performance is insufficient.
[0010] PATENT DOCUMENT 1: JP-A-10-324897 (Scope of the Claims,
paragraph 0009)
DISCLOSURE OF THE INVENTION OBJECT OF THE INVENTION
[0011] The object of the present invention is to provide a solvent
composition which is capable of removing soils such as oils
attached to the surface of an article made of an acrylic resin or
an article coated with an acrylic resin, without damaging it.
MEANS TO ACCOMPLISH THE OBJECT
[0012] The present invention provides an azeotrope-like solvent
composition comprising from 38 to 41 mass % of
(2,2,2-trifluoroethoxy)-1,1,2,2-tetrafluoroethane and from 59 to 62
mass % of perfluorohexane. The boiling point of this azeotrope-like
solvent composition at a pressure of 1.011.times.10.sup.5 Pa is
from 47 to 48.degree. C. Here, the azeotrope-like solvent
composition is defined as a mixed solvent composition having a
relative volatility within a range of 1.00.+-.0.04.
[0013] Further, the present invention provides a mixed solvent
composition comprising from 30 to 60 mass % of
(2,2,2-trifluoroethoxy)-1,1,2,2-tetrafluoroethane and from 40 to 70
mass % of perfluorohexane.
[0014] In the present invention, perfluorohexane indicates
perfluorohexane containing n-perfluorohexane and/or is
perfluoroisohexane as the main component. Here, the total content
of n-perfluorohexane and perfluoroisohexane in perfluorohexane is
preferably at least 90 mass %.
[0015] In this specification,
(2,2,2-trifluoroethoxy)-1,1,2,2-tetrafluoroethane is hereinafter
referred to as HFE-347.
EFFECTS OF THE INVENTION
[0016] The azeotrope-like solvent composition and the mixed solvent
composition of the present invention have a small effect on e.g. an
acrylic resin. Accordingly, in a case where these solvent
compositions are used for cleaning articles made of an acrylic
resin or articles coated with an acrylic resin, these articles can
be cleaned without haze or cracking.
[0017] Further, the azeotrope-like solvent composition and the
mixed solvent composition of the present invention can readily
remove contaminants such as oils, dusts, particles and resin
shavings, droplets of a solvent having a high surface tension and a
small specific gravity, water droplets, etc, attached to the
surface of articles to be cleaned.
BEST MODE FOR CARRYING OUT THE INVENTION
[0018] An azeotrope-like solvent composition has such an advantage
that when this solvent composition is repeatedly evaporated and
condensed, the solvent composition will not change, and therefore a
very stable cleaning performance will be obtained. Accordingly, the
azeotrope-like solvent composition of the present invention has the
same advantage as above.
[0019] The azeotrope-like solvent composition of the present
invention comprises solely HFE-347 and perfluorohexane. Further,
the mixed solvent composition of the present invention essentially
comprises HFE-347 and perfluorohexane, and may further contain
another compound. The content of another compound is preferably at
most 20 mass % and particularly preferably at most 10 mass %.
[0020] As such another compound, at least one compound selected
from the group consisting of hydrocarbons, alcohols, ketones,
halogenated hydrocarbons, ethers, esters and glycol ethers, may be
mentioned. Further, fluorinated ethers are excluded from the ethers
represented above, and the halogenated hydrocarbons are
hydrocarbons, which are substituted with at least one chlorine
atom.
[0021] As the hydrocarbons, C.sub.5-15 linear or cyclic, saturated
or unsaturated hydrocarbons are preferred, and n-pentane,
2-methylbutane, n-hexane, 2-methylpentane, 2,2-dimethylbutane,
2,3-dimethylbutane, n-heptane, 2-methylhexane, 3-methylhexane,
2,4-dimethylpentane, n-octane, 2-methylheptane, 3-methylheptane,
4-methylheptane, 2,2-dimethylhexane, 2,5-dimethylhexane,
3,3-dimethylhexane, 2-methyl-3-ethylpentane,
3-methyl-3-ethylpentane, 2,3,3-trimethylpentane,
2,3,4-trimethylpentane, 2,2,3-trimethylpentane, 2-methylheptane,
2,2,4-trimethylpentane, n-nonane, 2,2,5-trimethylhexane, n-decane,
n-dodecane, cyclopentane, methylcyclopentane, cyclohexane,
methylcyclohexane, ethylcyclohexane or bicyclohexane may, for
example, be mentioned. Among them, a C.sub.5-7 hydrocarbon such as
n-pentane, cyclopentane, n-hexane, cyclohexane or n-heptane is
preferred.
[0022] As the alcohols, C.sub.1-16 linear or cyclic alcohols are
preferred, and methanol, ethanol, n-propyl alcohol, isopropyl
alcohol, n-butyl alcohol, sec-butyl alcohol, isobutyl alcohol,
tert-butyl alcohol, 1-pentyl alcohol, 2-pentyl alcohol,
1-ethyl-1-propyl alcohol, 2-methyl-1-butyl alcohol,
3-methyl-1-butyl alcohol, 3-methyl-2-butyl alcohol, neopentyl
alcohol, 1-hexyl alcohol, 2-methyl-1-pentyl alcohol,
4-methyl-2-pentyl alcohol, 2-ethyl-1-butyl alcohol, 1-heptyl
alcohol, 2-heptyl alcohol, 3-heptyl alcohol, 1-octyl alcohol,
2-octyl alcohol, 2-ethyl-1-hexyl alcohol, 1-nonyl alcohol,
3,5,5-trimethyl-1-hexyl alcohol, 1-decyl alcohol, 1-dodecyl
alcohol, cyclohexyl alcohol, 1-methylcyclohexyl alcohol,
2-methylcyclohexyl alcohol, 3-methylcyclohexyl alcohol,
4-methylcyclohexyl alcohol, .alpha.-terpineol,
2,6-dimethyl-4-heptyl alcohol, 1-tetradecyl alcohol, ethylene
glycol, diethylene glycol or propylene glycol may, for example, be
mentioned. Among them, an alkyl alcohol having at most 3 carbon
atoms, such as methanol, ethanol or isopropyl alcohol is
preferred.
[0023] As the ketones, C.sub.3-9 linear or cyclic ketones are
preferred, and specifically, acetone, methyl ethyl ketone,
2-pentanone, 3-pentanone, 2-hexanone, methyl isobutyl ketone,
2-heptanone, 3-heptanone, 4-heptanone, diisobutyl ketone,
cyclohexanone, 2-methylcyclohexanone, 3-methylcyclohexanone,
4-methylcyclohexanone or acetophenone may, for example, be
mentioned. Among them, a C.sub.3-4 ketone such as acetone or methyl
ethyl ketone is preferred.
[0024] As the halogenated hydrocarbons, C.sub.1-6 saturated or
unsaturated, chlorinated or chlorofluorinated hydrocarbons are
preferred, and methylene chloride, 1,1-dichloroethane,
1,2-dichloroethane, 1,1,2-trichloroethane,
1,1,1,2-tetrachloroethane, 1,1,2,2-tetrachloroethane,
pentachloroethane, 1,1-dichloroethylene, cis-1,2-dichloroethylene,
trans-1,2-dichloroethylene, trichloroethylene, tetrachloroethylene,
1,2-dichloropropane, 1,1-dichloro-2,2,3,3,3-pentafluoropropane
(HCFC-225ca), 1,3-dichloro-1,1,2,2,3-pentafluoropropane
(HCFC-225cb), 1,1-dichloro-1-fluoroethane (HCFC-141b) or
decafluoropentane may, for example, be mentioned. Among them, a
C.sub.1-2 chlorinated hydrocarbon such as methylene chloride,
trichloroethylene or tetrachloroethylene, HCFC-225ca, HCFC-225cb or
HCFC-141b is preferred.
[0025] As the ethers, C.sub.2-8 linear or cyclic ethers are
preferred, and diethyl ether, dipropyl ether, diisopropyl ether,
dibutyl ether, ethyl vinyl ether, butyl vinyl ether, anisole,
phenetole, 4-methyl anisole, dioxane, furan, 2-methylfuran or
tetrahydrofuran may, for example, be mentioned. Among them, a
C.sub.4-6 ether such as diethyl ether, diisopropyl ether, dioxane
or tetrahydrofuran is preferred.
[0026] As the esters, C.sub.2-19 linear or cyclic esters are
preferred, and specifically, methyl acetate, ethyl acetate, propyl
acetate, isopropyl acetate, butyl acetate, isobutyl acetate,
sec-butyl acetate, pentyl acetate, (3-methoxy)butyl acetate,
sec-hexyl acetate, 2-ethylbutyl acetate, 2-ethylhexyl acetate,
cyclohexyl acetate, benzyl acetate, methyl propionate, ethyl
propionate, butyl propionate, ethyl 2-hydroxy-2-methyl propionate,
diethyl phthalate or dibutyl phthalate may, for example, be
mentioned. Among them, a C.sub.3-4 ester such as methyl acetate or
ethyl acetate is preferred.
[0027] The glycol ethers are preferably glycol ethers having a
hydrogen atom of one or both of hydroxyl groups of a dimer to
tetramer of a C.sub.2-4 dihydric alcohol substituted by a C.sub.1-6
alkyl group, and specifically, such glycol ethers are ethylene
glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene
glycol monoisopropyl ether, ethylene glycol monobutyl ether,
ethylene glycol monohexyl ether, ethylene glycol dimethyl ether,
ethylene glycol diethyl ether, ethylene glycol dibutyl ether,
ethylene glycol monomethoxymethyl ether, diethylene glycol
monomethyl ether, diethylene glycol monoethyl ether, diethylene
glycol monobutyl ether, diethylene glycol dimethyl ether,
diethylene glycol ethylmethyl ether, diethylene glycol diethyl
ether, diethylene glycol dibutyl ether, propylene glycol monomethyl
ether, propylene glycol monoethyl ether, propylene glycol monobutyl
ether, dipropylene glycol monomethyl ether, dipropylene glycol
monoethyl ether, dipropylene glycol monopropyl ether and
dipropylene glycol monobutyl ether.
[0028] The mixed solvent composition of the present invention
preferably contains a C.sub.1-3 alcohol, especially ethanol or
isopropyl alcohol, whereby the cleaning performance can be
improved, and additionally, it can be used in an application of
so-called dewatering/drying to remove water from an article to the
surface of which water is attached. Further, in a case where the
mixed solvent composition containing a C.sub.1-3 alcohol can form
an azeotropic composition or azeotrope-like composition, it is
preferred to select a compositional ratio suitable for forming the
azeotropic solvent composition or the azeotrope-like solvent
composition.
[0029] Further, primarily in order to increase the stability, one
or more of the following compounds may be contained in the
azeotrope-like solvent composition or the mixed solvent composition
in the amount of compounds from 0.001 to 5 mass %.
[0030] The compound to be contained may, for example, be a nitro
compound such as nitromethane, nitroethane, nitropropane or
nitrobenzene; an amine such as diethylamine, triethylamine,
isopropylamine, diisopropylamine or n-butylamine; a phenol such as
phenol, o-cresol, m-cresol, p-cresol, thymol, p-t-butylphenol,
t-butyl catechol, catechol, isoeugenol, o-methoxyphenol, bisphenol
A, isoamyl salicylate, benzyl salicylate, methyl salicylate or
2,6-di-t-butyl-p-cresol; and a triazole such as
2-(2'-hydroxy-5'-methylphenyl)benzotriazole,
2-(2'-hydroxy-3'-t-butyl-5'-methylphenyl)-5-chlorobenzotriazole,
1,2,3-benzotriazole or
1-[(N,N-bis-2-ethylhexyl)aminomethyl]benzotriazole.
[0031] As materials of articles to be cleaned by using the
azeotrope-like solvent composition or the mixed solvent composition
of the present invention, glass, ceramics, elastomer or metal may,
for example, be mentioned in addition to a plastic such as an
acrylic resin. Further, specific examples of the above articles,
may be electronic instruments, electrical instruments, precision
machines, precision instruments, optical articles, etc., or their
components such as ICs, micromotors, relays, bearings, optical
lenses, glass substrates, etc.
[0032] As soils to be removed by using the azeotrope-like solvent
composition or the mixed solvent composition of the present
invention, soils attached at the time of producing an article or a
part constituting the article, which has to be removed ultimately,
may be mentioned, and specifically contaminants such as some oils,
dusts, particles and resin shavings may, for example, be mentioned.
Further, by using the azeotrope-like solvent composition or the
mixed solvent composition of the present invention, it is possible
to remove droplets of a solvent having a high surface tension and a
small specific gravity, water droplets, etc.
[0033] In order to remove such soils, it is effective to bring each
solvent composition of the present invention into contact with the
surface of an article to be cleaned. As a specific method, hand
wiping, dip cleaning, spray cleaning, immersion-oscillation
cleaning, immersion-ultrasonic cleaning, vapor cleaning or a
combination thereof can, for example, be utilized.
EXAMPLES
(Measurement of Vapor-Liquid Equilibrium)
[0034] 300 g of a solvent composition obtained by mixing HFE-347
and PF-5060 (perfluorohexane, trade name of Sumitomo 3M Limited) at
various weight ratios was put in an othmer vapor-liquid equilibrium
still, and distillation was carried out at atmospheric pressure
from 9.96.times.10.sup.4 to 1.02.times.10.sup.5 Pa. At the time
when the temperatures of the gas phase and the liquid phase reached
equilibrium, samples of the solvent composition from the gas phase
and the liquid phase were obtained, and then the compositions of
HFE-347 and PF-5060 were analyzed by gas chromatography. As a
result, the compositions of the gas phase and the liquid phase were
equal in amounts of HFE-347=39.5 mass % and PF-5060=60.5 mass % at
atmospheric pressure (1.011.times.10.sup.5 Pa). The temperature of
the gas phase was 47.6.degree. C.
(Confirmation Test for Effect on Acrylic Resin)
[0035] In accordance with the following method, an effect of the
solvent composition on an acrylic resin was tested. Examples 1 to 3
are examples of the present invention, and Example 4 is a
comparative example.
[0036] As indicated in Table 1, solvent compositions comprising
HFE-347 and PF-5060 (Examples 1 to 4) were prepared. Then, a test
coupon 25 mm.times.30 mm.times.2 mm in size with a hole 6 mm in
diameter made of an acrylic resin (Acrylite L, trade name of
Mitsubishi Rayon Co., Ltd.) was immersed in 100 mL of each solvent
composition at room temperature (21.degree. C.) for 1 minute and
taken out, and its appearance was observed. The results are shown
in Table 1. In Table 1, 0 indicates that substantially no change
was observed, and 1 indicates that cracking was observed at the
periphery of the hole. TABLE-US-00001 TABLE 1 Solvent composition
(mass Effect on acrylic Example ratio) resin 1 HFE-347 (30)/PF-5060
(70) 0 2 HFE-347 (40)/PF-5060 (60) 0 3 HFE-347 (60)/PF-5060 (40) 0
4 HFE-347 (70)/PF-5060 (30) 1
<Confirmation Test for Effect on Flexible Polyvinyl Chloride
Resin>
[0037] In accordance with the following method, an effect of the
solvent composition on a flexible polyvinyl chloride resin was
tested. Examples 5 to 7 are examples of the present invention, and
Example 8 is a comparative example.
[0038] As indicated in Table 2, solvent compositions comprising
HFE-347 and PF-5060 (Examples 5 to 7) and a composition comprising
HFE-347 (Example 8) were prepared. Then, a test coupon 25
mm.times.30 mm.times.2 mm in size with a hole 6 mm in diameter made
of a flexible polyvinyl chloride resin (Toughnyl, trade name of
Japan Wavelock Co., Ltd.) was immersed in 100 mL of each solvent
composition at the boiling point (56.degree. C.) for 3 days and
taken out, and its appearance was observed. The results are shown
in Table 2. In Table 2, 0 indicates that substantially no change
was observed, and 1 indicates that white discoloration was observed
on the entire test coupon. TABLE-US-00002 TABLE 2 Solvent
composition (mass Effect on flexible Example ratio) polyvinyl
chloride resin 5 HFE-347 (30)/PF-5060 (70) 0 6 HFE-347 (40)/PF-5060
(60) 0 7 HFE-347 (60)/PF-5060 (40) 0 8 HFE-347 (100) 1
<Cleaning Rest for Degreasing>
[0039] In accordance with the following method, a test for cleaning
oils was carried out by using the solvent composition. Examples 9
and 10 are examples of the present invention, and Examples 11 to 13
are comparative examples.
[0040] A surface of a test coupon 50 mm.times.50 mm.times.2 mm in
size made of iron (SPCC-SB) was uniformly coated with 0.3 g of
Panasate 810 (trade name of NOF Corporation) as grease, and the
test coupon was immersed in each solvent composition as indicated
in Table 2 at 40.degree. C. for 1 minute, then, immersed in the
solvent composition having the same composition at 25.degree. C.
for 1 minute, and further exposed to vapor of the solvent
composition for 1 minute, which was produced by heating, to dry.
Meanwhile, HFE-7100 used in Example 13 is C.sub.4F.sub.9OCH.sub.3
manufactured by Sumitomo 3M Limited.
[0041] The test coupon was weighed at the beginning and the end of
the test, and the amount of remaining grease on the test coupon and
removal ratio of grease were calculated. The results are shown in
Table 3. TABLE-US-00003 TABLE 3 Amount of Solvent attached Removal
composition grease ratio Outer Example (mass ratio) (mg) (%)
appearance 9 HFE-347 (40)/ <3 >99 Good PF-5060 (60) 10
HFE-347 (30)/ <3 >99 Good PF-5060 (70) 11 HFE-347 (20)/ 15 95
Grease PF-5060 (80) partially attached 12 PF-5060 (100) 81 73
Grease entirely attached 13 HFE-7100 (100) 45 85 Grease entirely
attached
<Particle Removal Test>
[0042] In accordance with the following method, a particle removal
test was carried out by using the solvent composition. Examples 14
to 16 are examples of the present invention.
[0043] On the surface of a test coupon 30 mm.times.25 mm.times.2 mm
in size with a hole 6 mm in diameter made of a low-pressure
polyethylene, fine particles about 3 mg in weight obtained by
finely grinding the same material constituting the test coupon were
uniformly sprinkled. The test coupon was immersed in each solvent
composition as indicated in Table 4 at 40.degree. C. for 1 minute
with applying 40 kHz and 200 W ultrasonic waves, then, immersed in
the solvent composition having the same composition at 25.degree.
C. for 1 minute, and further exposed to vapor of the solvent
composition for 1 minute, which was produced by heating, to
dry.
[0044] The test coupon after the test was visually observed, and
the presence or absence of the remaining fine particles on the
surface of the test coupon was confirmed. The results are shown in
Table 4. TABLE-US-00004 TABLE 4 Solvent Presence or composition
absence of Example (mass ratio) particles 14 HFE-347 (30)/PF-5060
(70) Absence 15 HFE-347 (40)/PF-5060 (60) Absence 16 HFE-347
(60)/PF-5060 (40) Absence
<Dewatering Test for Drying>
[0045] In accordance with the following method, a dewatering test
for drying was carried out by using the solvent composition.
Examples 17 and 18 are examples of the present invention.
[0046] A mixed solution was prepared by adding 5 parts by mass of
ethanol to 100 parts by mass of each solvent composition as
indicated in Table 5.
[0047] A glass plate 50 mm.times.50 mm.times.2 mm in size
preliminarily cleaned with a water-based cleaning agent and pure
water was immersed in pure water, then, immersed in each mixed
solution at 40.degree. C. for 1 minute with applying 40 kHz and 200
W ultrasonic waves, and further exposed to vapor of the solvent
composition for 1 minute, which was produced by heating, to rinse
and to dry.
[0048] The test coupon after the test was visually observed, and
the presence or absence of remaining water on the surface of the
test coupon was confirmed. The results are shown in Table 5.
TABLE-US-00005 TABLE 5 Solvent composition Presence or Example
(mass ratio) absence of water 17 HFE-347 (40)/PF-5060 (60) Absence
18 HFE-347 (30)/PF-5060 (70) Absence
INDUSTRIAL APPLICABILITY
[0049] The solvent compositions of the present invention are useful
for removing soils such as dusts or oils attached to the surface of
articles such as electronic components such as IC, precision
mechanical parts, glass substrates, molded-resin parts, etc.,
especially articles, of which at least the surface is made of an
acrylic resin.
[0050] The entire disclosure of Japanese Patent Application No.
2004-292618 filed on Oct. 5, 2004 including specification, claims
and summary are incorporated herein by reference in its
entirety.
* * * * *